10 Pull requests merged by 8 people

• Add stubtest test for property aliases

  #19567 merged Aug 2, 2025

• Add internal flag to disable expression cache

  #19569 merged Aug 2, 2025

• Update crash issue template to use syntax highlighting in code blocks

  #19527 merged Aug 2, 2025

• Optimize bind_self() and deprecation checks

  #19556 merged Aug 2, 2025

• fix: prevent crash on dataclass with PEP695 TypeVarTuple on py3.13

  #19565 merged Aug 2, 2025

• Keep trivial instances and aliases during expansion

  #19543 merged Aug 1, 2025

• feat: new mypyc primitive for weakref.ref

  #19099 merged Jul 31, 2025

• Explicitly check case‐sensitivity of file system for tests

  #19540 merged Jul 31, 2025

• Update changelog for 1.17.1

  #19550 merged Jul 31, 2025

• Update test requirements

  #19539 merged Jul 30, 2025

9 Pull requests opened by 5 people

• [wip] [mypyc] feat: quasi-constant folding for DictExpr and TupleExpr

  #19542 opened Jul 30, 2025

• Move Windows tests from oldest to newest version

  #19545 opened Jul 30, 2025

• Update update_data.py: make the space in error comments optional

  #19546 opened Jul 30, 2025

• Document mypy exit codes

  #19549 opened Jul 31, 2025

• Allow skip and xfail to both be applied to test cases

  #19552 opened Jul 31, 2025

• refactor `visit_conditional_expr` to fix ternary behavior (option 2)

  #19562 opened Aug 1, 2025

• refactor `visit_conditional_expr` to fix ternary behavior (option 1)

  #19563 opened Aug 1, 2025

• [stubtest] Allow runtime-existing aliases of types marked as `@type_check_only`

  #19568 opened Aug 2, 2025

• Remove --new-type-inference flag

  #19570 opened Aug 2, 2025

7 Issues closed by 5 people

• Stubtest thinks a property alias isn't read-only in stubs

  #19509 closed Aug 2, 2025

• Generic dataclass with TypeVarTuple crashes Mypy

  #19559 closed Aug 2, 2025

• mypy error with generics typing and singledispatch

  #19564 closed Aug 2, 2025

• func-returns-value check is overly restrictive and prevents legitimate None-returning functions

  #19555 closed Aug 1, 2025

• crash for a very specific invocation of mypy: `assert isinstance(visitor, SyntheticTypeVisitor)`

  #19286 closed Aug 1, 2025

• 1.15.0 regression: `list.append` false positive with `Signals` enum

  #18628 closed Jul 31, 2025

• [docs] Update Code Conventions to reflect the switch from flake8 to ruff

  #19498 closed Jul 31, 2025

10 Issues opened by 4 people

• Type `mypy/config_parser.py` without `Any`

  #19566 opened Aug 2, 2025

• Irregular inference with ternary based on attribute.

  #19561 opened Aug 1, 2025

• `meet_types` gives unexpected results when meeting literal and Instance

  #19560 opened Aug 1, 2025

• Mypyc runtime TypeError exceptions when you change inherited method to a staticmethod

  #19558 opened Aug 1, 2025

• Mypyc gcc compilation fails with specific duplicate variable definition

  #19557 opened Aug 1, 2025

• Stderr in regular tests should probably go to out as well

  #19554 opened Jul 31, 2025

• Unexpected order dependence when assigning to multiple targets

  #19553 opened Jul 31, 2025

• join is not always permutation invariant

  #19551 opened Jul 31, 2025

• Config errors sometimes result in exit code 0

  #19548 opened Jul 31, 2025

• "# E:" lines (etc) in test files are ignored at the beginning of lines

  #19547 opened Jul 31, 2025

27 Unresolved conversations

Sometimes conversations happen on old items that aren’t yet closed. Here is a list of all the Issues and Pull Requests with unresolved conversations.

• Enable pretty by default

  #19510 commented on Jul 31, 2025 • 4 new comments

• Fix #19491, crash when using enable_error_code value of wrong type in pyproject.toml

  #19494 commented on Aug 2, 2025 • 4 new comments

• [wip] [mypyc] feat: unroll certain for loops with known params

  #19518 commented on Jul 30, 2025 • 0 new comments

• [match-case] Fix narrowing of class pattern with union-argument.

  #19517 commented on Aug 1, 2025 • 0 new comments

• [mypyc] feat: cache len for iterating over immutable types

  #19503 commented on Jul 31, 2025 • 0 new comments

• [mypyc] feat: unwrap NewType types to their base types for optimized code paths

  #19497 commented on Jul 31, 2025 • 0 new comments

• Fix `Enum.value` inference for `Enum`s with `@cache`d methods

  #19374 commented on Aug 1, 2025 • 0 new comments

• Do not display import-related errors after module-level always false assert

  #19347 commented on Aug 1, 2025 • 0 new comments

• feat: new mypyc primitives for weakref.proxy

  #19217 commented on Jul 31, 2025 • 0 new comments

• Handle `__hash__ = None` in somewhat more intuitive fashion

  #19168 commented on Aug 1, 2025 • 0 new comments

• WIP: new mypyc primitive for `weakref.ref.__call__`

  #19145 commented on Jul 31, 2025 • 0 new comments

• Fix/attrs init overload

  #19104 commented on Jul 31, 2025 • 0 new comments

• Improve cli help somewhat

  #19073 commented on Jul 31, 2025 • 0 new comments

• Add a flag `--enable-all-error-codes`, which enables all error codes

  #19048 commented on Jul 31, 2025 • 0 new comments

• Bare ClassVar should infer type instead of defaulting to Any

  #5587 commented on Aug 2, 2025 • 0 new comments

• Multiple extensions using `get_base_class_hook` interfere with each other

  #19524 commented on Aug 1, 2025 • 0 new comments

• Type narrowing of `TypeVar` with abstract bases classes causes `[return-value]` error

  #19530 commented on Aug 1, 2025 • 0 new comments

• [regression] Type narrowing for through `not issubclass(…)` broken for union of TypeVar instance / types in 1.17

  #19529 commented on Aug 1, 2025 • 0 new comments

• plugin point for `ClassDef`

  #18729 commented on Aug 1, 2025 • 0 new comments

• No `TypeVar` variable inference in ternary operators

  #18817 commented on Aug 1, 2025 • 0 new comments

• Type hint `__lt__` as `(self, other: Self) -> bool` makes mypy think that `__le__` is not supported.

  #16711 commented on Aug 1, 2025 • 0 new comments

• `func-returns-value` false positive for union type?

  #19433 commented on Aug 1, 2025 • 0 new comments

• Incorrect handling of overloads with `defaultdict` and `MutableMapping`

  #19525 commented on Aug 1, 2025 • 0 new comments

• ImportError: dynamic module does not define module export function

  #19531 commented on Jul 31, 2025 • 0 new comments

• False positive typing.Self has incompatible type when method uses class' generic type

  #16871 commented on Jul 31, 2025 • 0 new comments

• 1.17 Release Planning

  #19306 commented on Jul 31, 2025 • 0 new comments

• EncodingWarning when running under PyPy

  #17057 commented on Jul 31, 2025 • 0 new comments